Topics

Use of alkylarsonium directing agents for the synthesis and study of zeolites.

08:00 EDT 11th October 2019 | BioPortfolio

Summary of "Use of alkylarsonium directing agents for the synthesis and study of zeolites."

Expanding the previously known family of onium (ammonium, phosphonium and sulfonium) organic structure-directing agents (OSDAs) for the synthesis of zeolite MFI, a new member, the arsonium cations, is used for the first time. The new group of tetraalkylarsonium cations has allowed synthesizing the zeolite ZSM-5 with several different chemical compositions, opening a route for the synthesis of zeolites with new series of OSDA. Moreover, the use of As replacing N in the OSDA allows introducing probe atoms that facilitate the study of these molecules by powder X-ray diffraction (PXRD), solid-state nuclear magnetic resonance (MAS-NMR) and X-ray absorption spectroscopy (XAS). Finally, the influence of trivalent elements such as B, Al or Ga isomorphically replacing Si atoms in the framework structure and its interaction with the As species has been studied. We have proved the suitability of tetraalkylarsonium cation for carrying out crystallization of zeolites and also, the benefit of the presence of As atoms in the occluded OSDA, which allows its advanced characterization as well as the study of its evolution during OSDA removal by thermal treatments.

Affiliation

Journal Details

This article was published in the following journal.

Name: Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Pages:

Links

DeepDyve research library

PubMed Articles [17777 Associated PubMed Articles listed on BioPortfolio]

π-π Interactions of Aromatic Groups in Amphiphilic Molecules for Directing Hierarchical Porous Zeolites.

The development of hierarchical macro- or mesoporous zeolites is essential in zeolite synthesis because the size of micropores limits mass transport and their use as industrial catalysts for bulky mol...

Rediscovery of the Importance of Inorganic Synthesis Parameters in the Search for New Zeolites.

Zeolites and related crystalline microporous materials with cavities and channels of molecular dimensions are of major importance for applications ranging from ion-exchange to adsorption and to cataly...

Phase Transformation Behavior of a Two-Dimensional Zeolite.

Understanding the molecular-level mechanisms of phase transformation in solids is of fundamental interest for beneficial industrial technologies of functional materials like zeolites. Two-dimensional ...

Machine Learning Applied to Zeolite Synthesis: The Missing Link for Realizing High-Throughput Discovery.

Zeolites are microporous crystalline materials with well-defined cavities and pores, which can be prepared under different pore topologies and chemical compositions. Their preparation is typically def...

Direct synthesis of core-shell MFI zeolites with spatially tapered trimodal mesopores via controlled orthogonal self-assembly.

Manipulating pore hierarchy in porous materials is an attractive, yet difficult challenge in crystalline zeolites. Here, we report core-shell MFI zeolites having trimodal mesopores with size gradually...

Clinical Trials [2305 Associated Clinical Trials listed on BioPortfolio]

A Study Evaluating the Effects of Lipid Lowering Treatment on Steroid Synthesis

Cholesterol is the precursor of glucocorticoids, mineralocorticoids and sex steroids. Both adrenal and non-adrenal (ovarian + testicular) all steroid hormones are primarily synthesized usi...

Effects of Oral Supplementation of Arginine, Zinc and Vitamin C on Collagen Synthesis in Inguinal Hernia Patients

Collagen synthesis is depressed systemically in the immediate postoperative period. Arginine, zinc and vitamin C impact collagen synthesis. The aim of this study is to investigate the eff...

Open Label, Continuation Study of Cholic Acid in Subjects With Inborn Errors of Bile Acid Synthesis

The primary purpose of the study is to evaluate the therapeutic efficacy and safety of cholic acid in subjects with identified inborn errors of bile acid synthesis.

Inhaled Long-acting Bronchodilators With or Without Inhaled Glucocorticosteroids for Preventing Hospitalizations and Death in Elderly Patients With Chronic Obstructive Pulmonary Disease

This will be a phase IV, open label, multicenter, randomized pragmatic study in frail elderly patients with COPD. Participants will be treated with either inhaled LABD alone or LABD combin...

Effect of Nutrition on Muscle Protein Synthesis

The present proposal is designed to examine the effect of carbohydrate and protein co-ingestion on muscle protein synthesis during endurance type exercise activities. We hypothesize that m...

Medical and Biotech [MESH] Definitions

Zeolites. A group of crystalline, hydrated alkali-aluminum silicates. They occur naturally in sedimentary and volcanic rocks, altered basalts, ores, and clay deposits. Some 40 known zeolite minerals and a great number of synthetic zeolites are available commercially. (From Merck Index, 11th ed)

Agents that are capable of inserting themselves between the successive bases in DNA, thus kinking, uncoiling or otherwise deforming it and therefore preventing its proper functioning. They are used in the study of DNA.

Chemical agents that uncouple oxidation from phosphorylation in the metabolic cycle so that ATP synthesis does not occur. Included here are those IONOPHORES that disrupt electron transfer by short-circuiting the proton gradient across mitochondrial membranes.

Compounds that interfere with FATTY ACID SYNTHASE resulting in a reduction of FATTY ACIDS. This is a target mechanism in humans of some ANTINEOPLASTIC AGENTS and ANTI-OBESITY AGENTS and of some ANTI-INFECTIVE AGENTS which interfere with CELL WALL and CELL MEMBRANE formation.

Compounds which inhibit the synthesis of proteins. They are usually ANTI-BACTERIAL AGENTS or toxins. Mechanism of the action of inhibition includes the interruption of peptide-chain elongation, the blocking the A site of ribosomes, the misreading of the genetic code or the prevention of the attachment of oligosaccharide side chains to glycoproteins.

Quick Search


DeepDyve research library

Relevant Topic

Radiology
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...


Searches Linking to this Article